of hamilton



mtmmedf N. PETERS, PHOTO-UTHOGRAPHEE, WASHINGTON. D. C

w. ai.. KIRK, o F HAMILTON. culo.

Letters .Patent No. 82,328, y,dated September 22, 1868.

IMPROVEMENT IN HEAD-BLOCKS.

tite .tlgehnle nimh tu in ttm wird atent mit `lurking; but at the same.

To ALL wHoM-IT MAY CONGERN;

Be it known that I, W. A. L. KIRK, of Hamilton, in the county of Butler,and State of Ohio, have invented a new and useful Improvement inHead-Block for Saw-Mills; and I do hereby declare that the following isa full, clear, and exact description thereof, which will enable othersskilled in the art to make and use the same, reference being had to theaccompanying drawings, forming a part of this specication.

Figure l is a perspective view of a part of a saw-mill carriage,illustrating my invention.

Figure 2 is a detail perspective view of the indexroller.

Figure 3 isan end view of the same.

Similar letters of reference indicate corresponding parts.

My invention has for its object to furnish an improved device forattachment to head-blocks, by means of which the eawyer may convenientlyadjust the knee in such positions that a given number of pieces of auniform width may ee cut from timber of a given thickness.

And it consists in the combination of a polygonal index-roller with theknee-guide and knee of the headblcck, as hereinafter more fullydescribed.

. A is the carriage, B is theknee-guide, and C is the knee, about theconstruction of which parts there is nothing new.

D is a roller, which works in bearings attached to or formed upon theside of the guide or slidefB, upon which the knee C is moved back andforth in the ordinary manner. The 'roller D is made polygonal in form,each face or angle being divided up into equal spaces, and numbered fromthe position of the saw when making the cut to the other end of the saidroller D. n spacing the roller, allowance is made for the kerf, so thatwhen sawn, the lumberlmay all be of the desired thickness, and thisthickness should be shown by figures placed at one or the other end ofsaid scale.

For convenience in setting the knee accurately, it should be providedwith an index or finger, E, pointing to the division-marks upon theindex-roller D, as shown in iig. 1.

ln using-.the index-roller D, if it is desired to saw a stick of timber'of any desired thickness, the roller is turned so asto 1bring the properscale upward, and it at once shows how many pieces the stick will make,and also serves as a guide in setting the knee B. In the sameway, if itis desired to cut a stick of timber into a given number of pieces, byturning the roller D, so as to bring the proper scale upward, it becomesan index for setting the knee, and at the same time shows whatvthickness the said pieces will have. l

Having thus described my invention, what claim as new, and desire tosecure by Letters Patent, is-

The index-roller D, constructed substantially as herein shown anddescribed, in combination with the headblock B C of a saw-mill, as andfor the purpose set forth.

The above specication of my invention signed by me, this eleventh day ofJuly, 1868.

W. A. L. KIRK.

Witnesses:

J. P. CAssnDY, ISRAEL M. WILLIAMS.

